/Engine/Source/Runtime/AssetRegistry/Public/AssetRegistry/AssetRegistryState.h
Add a dependency on the given AssetIdentifier (e.g. package) from each of the Referencers. Also adds a referencer link to each referencer on the AssetIdentifer's node.
void AddReferencers ( const [FAssetIdentifier](API\Runtime\CoreUObject\AssetRegistry\FAssetIdentifier) & AssetIdentifier, TConstArrayView< [FAssetDependency](API\Runtime\AssetRegistry\AssetRegistry\FAssetDependency) > Referencers )